The patient was admitted to the hospital with intermittent abdominal distension for more than 10 months, aggravated for 7 days, and congenital choledochal cyst with inflammation was considered in the enhanced abdominal CT. The patient had a large cyst and upper gastrointestinal obstruction, which was indicative of surgery, but with a large surgical scope, and with biliary-intestinal anastomosis, intestinal-intestinal anastomosis, and laparoscopic surgical techniques were more demanding, and the decision was made for laparoscopic choledochal cyst excision after discussion in the department and active pre-operative preparations. Under the guidance of Prof. Sanyuan Hu and Prof. Zongli Zhang, the operation was performed by Associate Professor Bin Jin, Attending Physician Gang Du, Attending Physician Yanfeng Liu, and Physician Jia Li. The exploration: the gallbladder was about 10*5cm, the common bile duct and common hepatic duct were dilated, forming a cyst of about 12*10cm, which was compressing the duodenum and adhered to the duodenum, and the cyst was large in size. Firstly, decompression was given to the cyst, and the cyst was incised in the anterior wall of the cyst to suction the yellow bile, and then free from the right wall of the cyst, and then the yellow bile was removed. Then the right wall, posterior wall and left wall of the cyst were freed, and then the cyst was freed downward to the normal common bile duct, the common bile duct was broken, the distal end was closed and the proximal end was uplifted, and then the gallbladder artery was dissected, the gallbladder was freed from the bed of the gallbladder, and the bile ducts were normal in texture at the point where the left and right hepatic ducts converged into the common hepatic duct, which was disconnected, and the cyst and the gallbladder were resected, then the jejunum was broken at a distance of about 20 cm from the flexural ligament, and then the jejunum was closed distally and then lifted upward in front of the colon, and the common hepatic duct was carried out. After the distal end was closed, the jejunum was lifted up in front of the colon, the common hepatic duct was anastomosed with the distal jejunum, and the anastomosis was smooth with satisfactory hemotransfer tension, then the subumbilical incision was extended, the cyst and gallbladder were put into the retractor to be taken out, and then the small bowel was lifted out from the incision, and the proximal jejunum was anastomosed with the jejunum about 40 cm from the severed end of the distal jejunum. Postoperative pathology showed that the histologic image was consistent with congenital choledochal cyst, and the patient got out of bed at an early stage after the operation, could eat and drink at an early stage, and recovered well. Compared with the traditional surgical method, laparoscopic surgery, the longest incision is only about 5cm (for removing specimen and assisting intestinal anastomosis), with small trauma, short time of abdominal exposure, good peritoneal integrity, fast recovery, little pain, and short hospitalization time. Fast, less pain, shorter hospitalization time, fewer complications. Of course, laparoscopic surgery is technically more demanding, requiring the surgeon to be proficient not only in open surgery techniques, but also in laparoscopic skills. However, with the accumulation of experience and the continuous improvement of surgical techniques, this type of surgery will become the most ideal surgical procedure for doctors and patients. ?